//Author: Puremg
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC optimize(3,"Ofast")
#include <bits/stdc++.h>
#define deg(a) cout<<#a<<'='<<a<<"\n"
// #define int long long
#define all(a) a.begin(), a.end()
#define db double
using namespace std;
typedef pair<int,int> PII;
typedef long long ll;
const int mod = 1e9 + 7;
const int N = 5e3;
const db eps = 1e-10;
const db pi = acos(-1);
// mt19937_64 rng(random_device{}());

vector<bitset<N>>d;
int n;

int check(int x){
  auto num=d[x];



  for(int i=0;i<n;++i){
    if(d[x][i]){
      num|=d[i];
    }
  }

  // cout<<x<<'\n';
  // for(int i=0;i<n;++i) cout<<num[i];
  // cout<<'\n';

  for(int i=0;i<n;++i){
    if(i==x) continue;
    if(num[i]==0) return 0;
  }
  return 1;
}

void solve() {
  cin>>n;


  for(int i=0;i<n;++i){
    string str;
    cin>>str;
    reverse(str.begin(),str.end());
    bitset<N>num(str);
    d.push_back(num);
  }

  vector<int>ans;

  for(int i=0;i<n;++i){
    if(check(i)){
      ans.push_back(i);
    }
    if(ans.size()==3) break;
  }
  if(ans.size()<3){
    cout<<"NOT FOUND\n";
  }else{
    for(auto v:ans) cout<<v+1<<' ';
    cout<<'\n';
  }

}

signed main()
{
 // auto start_time = std::chrono::high_resolution_clock::now();
 // freopen("in.txt", "r", stdin);
 // freopen("out.txt", "w", stdout);
  cin.tie(nullptr)->sync_with_stdio(false);
  cout << fixed << setprecision(15);
  int T = 1;
  // cin >> T;
  while (T--) solve();
  // auto end_time = std::chrono::high_resolution_clock::now();
  // auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time);
  // std::cout << "程序运行时间：" << duration.count() << "毫秒" << std::endl;
  return 0;
}

/*
6
011010
000101
010111
100001
010100
100010
*/